Improvement in valve-cocks



/My//L inventori Witnesses:

UNITED STATES PATENT' OFFICE.

IMPROVEMENT IN VALVE-COCKS.

Specification forming part of Letters Patent No. 49,116, dated August 1,1865.

To all whom it may concern.-

Beit known that I, N A'IHANIEL JENKINS, of Bos-ton, in the county ofSuffolk and State of Massachusetts, have invented a new and usefulImprovement in Valve-Cocks; and I do hereby declare that the followingis a full, clear, and exact description ot' the construction andoperation of the same, reference being had to the accompanying drawing,forming a part of this specification.

The nature of my invention consists in the employment oi'an adjustablestop or regulator, in combination with the follower of a valvecock, toprevent thepncking from being injured by too much pressure, and todetermine when sufficient pressure shall have been given to the same.

To enable others skilled in the art to make and use my improvement, Iwill now proceed to describe the construction and operation of the same.

The drawing represents a vertical central section through a valveprovided with a hemispherical elastic packing and screw-follower. Thepacking may, however, be of any other suitable form in general use.

A is the inlet, O the valve scat, and B the outlet.

D is the valve-chamber, whose cap E is con F is the top of the cap E, towhich it is coniined by means of the screwz inclosng the packing g. i

N is a thumb-screw passing vertically through the wheel L, as shown inthe drawing. When the valve K is forced down sutlciently tight` upon itsseat C, the said thumbfscrew is screwed downward till its point strikesupon the top of the cap F. If the valve is now opened, the next time thefollower is screwed down to close the same it cannot be forced anyfarther than it was before, being prevented by the point of the screw Nstriking, as beforeon the top ot' the cap F. Thus the thumb-screwNbecomes an adjustable guide to show when the valve is properly closed,and a regulator to prevent the same from ever being injured or spoiledby too` great pressure of the follower upon it.

The drawing represents only one method of applying the principle of myinvention. Itis obvious, however, that the adjustable stop or regulatormaybe applied in variousother ways and accomplish the required result.For instance, au adjustable screw might enter the top of the cap F andproject above the same, so as to come in contact with the under side ofthe wheel L; or there might be check-nuts on the follower itself,between the wheel L and cap F.

I do not therefore confine myself to any specific device; but

What I claim as new, and desire to secure by Letters Patent, is-

The employment of an adjustable stop or regulator, N, or its equivalent,in combination with the follower of a valve-cock, substantially as setforth, and for the purpose described.

NATHL. JENKINS.

Witnesses:

GEO. H. CLARKE, N. AMES.'

